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DONETSK, UKRAINE - MARCH 05: Andrei Serebrennikov, a coal miner who survived an explosion at Zasyadtko mine but was exposed to dangerous levels of methane, undergoes an enriched oxygen treatment in a pressure chamber at the Regional Hosptial of Occupational Diseases on March 5, 2015 in Donetsk, Ukraine. The methane explosion in the mine on March 4, killed at least 10 miners, with more than 20 miners still trapped. (Photo by Andrew Burton/Getty Images)